An error occurred while making the HTTP request to https://localhost:8083/TestWCFService. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caused by a mismatch of the security binding between the client and the server.

The underlying connection was closed: An unexpected error occurred on a send.

Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

An existing connection was forcibly closed by the remote host

If the service is defined in the current solution, try building the solution and adding the service reference again.